ANGRYGREG Posted August 6, 2009 Report Share Posted August 6, 2009 My truck has been leaning out at part throttle. It only does it when I give it very little gas. No problems with AFR at WOT just when cruising at low speeds and It does it in every gear randomly, and not all the time. It acts like it's running out of gas like a little blip then it goes away. It seems to do it worse when the A/C is on. I know it's not harming the truck but it's driving me nuts. As far as a fuel pump I don't know what is in there it is whatever came from magnacharger. Is it my fuel pump? Fuel filter? Any input would be appreciated... My tuner looked at the file. Nothing was changed so I am pretty sure it is not the tune. It's always something. Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted August 6, 2009 Report Share Posted August 6, 2009 What fuel injectors are you running? Quote Link to comment Share on other sites More sharing options...
12'SROCK Posted August 6, 2009 Report Share Posted August 6, 2009 hook up a fuel pressure guage and see what going on with the fuel PSI Quote Link to comment Share on other sites More sharing options...
ANGRYGREG Posted August 6, 2009 Author Report Share Posted August 6, 2009 What fuel injectors are you running? The 42 lb injectors that came with the supercharger. I know they are not maxed out but do you think there could be an issue with them? They have about 30,000 miles on them. Quote Link to comment Share on other sites More sharing options...
12'SROCK Posted August 6, 2009 Report Share Posted August 6, 2009 The 42 lb injectors that came with the supercharger. I know they are not maxed out but do you think there could be an issue with them? They have about 30,000 miles on them. get your tunner and have him ride with you and log you IDC Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted August 6, 2009 Report Share Posted August 6, 2009 Next question, what size pulley are you running? Quote Link to comment Share on other sites More sharing options...
F1SSS Posted August 6, 2009 Report Share Posted August 6, 2009 I dont think its your fuel filter. I needed my replaced the dealership told me, had it done maybe 2-3 months after by a member here (I barely drive the truck). Never had the hiccup issue for those 2-3 months. Quote Link to comment Share on other sites More sharing options...
04CHASE Posted August 7, 2009 Report Share Posted August 7, 2009 you really need to have a fuel pressure gauge. this would help troubleshoot. dont think your fuel filter since you dont have one on the frame rail . my guess is fuel pump but could be in the tune as well. Quote Link to comment Share on other sites More sharing options...
blackbeast ss Posted August 7, 2009 Report Share Posted August 7, 2009 you might need to 60lb injectors......when i dropped from 3 to 2.8 i was mixing out the 42lb Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted August 7, 2009 Report Share Posted August 7, 2009 you might need to 60lb injectors......when i dropped from 3 to 2.8 i was mixing out the 42lb That's what I was getting to, 408 + Radix w/stock 42# Radix injectors = maxed out fuel injectors....... Quote Link to comment Share on other sites More sharing options...
ANGRYGREG Posted August 7, 2009 Author Report Share Posted August 7, 2009 Thanks for the help. I really don't think the injectors are maxed out. I haven't had this problem until recently and it only happens at very light throttle like 20 percent little blip it leans out and I step on the gas a little more and It goes away. It feels just like when you are running out of gas... How much are some 60 lb/hr injectors and does someone have a part # ??? I also don't know what fuel pump comes with the radix, can someone answer that for me? The AFR is right on at WOT so how can I be running out of injector at part throttle going 30 mph. I don't want to spend money on something that is not needed but if I need injectors then I guess I will buy them. Just trying to rule out all the things not wrong before I start dumping more money in this money pit... Thanks again guys. Anyone else have any suggestions. Quote Link to comment Share on other sites More sharing options...
ANGRYGREG Posted August 7, 2009 Author Report Share Posted August 7, 2009 you really need to have a fuel pressure gauge. this would help troubleshoot. dont think your fuel filter since you dont have one on the frame rail . my guess is fuel pump but could be in the tune as well. What fuel pump do you suggest Chase. Do you have a part #. Thanks for the help... Quote Link to comment Share on other sites More sharing options...
zippy Posted August 7, 2009 Report Share Posted August 7, 2009 A fuel pressure check would be the first thing to do. The second/first thing to do also would be to check to see if your power enrichment settings are where they need to be. In summer temps where underhood heat is high (even worse with the air on) your fuel gets very hot and can cause a lean condition at times. You really need to have someone log this occuring to see how the boost/tip in is. Quote Link to comment Share on other sites More sharing options...
ANGRYGREG Posted August 7, 2009 Author Report Share Posted August 7, 2009 A fuel pressure check would be the first thing to do. The second/first thing to do also would be to check to see if your power enrichment settings are where they need to be. In summer temps where underhood heat is high (even worse with the air on) your fuel gets very hot and can cause a lean condition at times. You really need to have someone log this occuring to see how the boost/tip in is. Thanks Zippy.. Quote Link to comment Share on other sites More sharing options...
kelleyperformance Posted August 8, 2009 Report Share Posted August 8, 2009 im with agreeing its not your injectors maxing out.... i dont doubt the injector duty cycle is very high at WOT, but i agree with zippy. that, or- i had some 50lb injectors that did the same thing. about the same RPM the truck would miss very badly, go away with any less or more throttle. came to find that at that exact airflow and flowrate of the injector, the fuel didnt atomize right because the nozzle of those injectors sprayed too wide, causing it to hit the manifold and in a way "puddle" and drip down. changed them to the semiens 60lb, never had the issue ever again Quote Link to comment Share on other sites More sharing options...
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